The indicated circuit uses an unusual buffer from National Semiconductor. The frequency is given by resistors R1 and R2 as well as capacitors C1 and C2.
The circuit that we will see below uses an element of the semiconductor family that is not yet...
This circuit is from 1994, from a technical documentation from National Semiconductor, but can be...
This circuit is from a 1967 US publication. The configuration can serve as a basis for designs...